11
Sep
2009
Broadband With Digital TV Broadcast – Compression and Streaming Economics (1)
Digital TV transmission is not transmitted in the traditional fashion of bit rates rather an advanced form of statistical multiplexing is adopted maximize the broadband. Broadband technology has advanced broadcasters and satellite providers in art of digital TV broadcast.It has also allowed broadcasters to allocate bandwidth dynamically to various programs based on the requirements of each program; this is meant to efficiently optimize the use of available bandwidth at every point in time. For example, an High Definition broadcast on of a track-and-field event would have fast-paced movement requiring a lot of extra bits, therefore more movement there is on screen, the more pixels need to update in each frame, so the less efficient the compression of the video stream becomes.But a newscast on same channel, with largely static talking heads, requires a lower bit rate for the same perceived quality. So the statistical multiplexer will shift a greater portion of the bits running down the broadcast pipe to a sporting event with many fast-paced movement than a talk show with less movements. The above is a typical scenario in the broadcast realm, where only a small number of programs are running on each channel. Now with Cable and satellite services transmitting hundreds of channels at a time with mixture of fast paced programs such as sports and less fast paced programs like news and talk shows, broadband users will experience tilling in some transmissions where more pixels are employed to update fast paced transmissions – and the bandwidth is not properly multiplexed to update the pixels.Tilling often occurs when there is over compression of programs in the transmission of the multiple channels in a bandwidth pipe. Since there no regulatory and monitoring when it comes to compression of HI-DEF content on those services, and in order not over compressed their programs, many cable channels and major networks broker individual contracts with each provider the minimum-quality-of-service for delivery the transmission of their broadcasts.
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